/* ============================
   Base Styles
   ============================ */
@import url('https://fonts.googleapis.com/css2?family=Source+Sans+3:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400;1,500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Patrick+Hand&display=swap');

body {
    font-family: 'Source Sans 3', 'Helvetica Neue', Helvetica, sans-serif;
    color: #0f172a;
    background-color: #f8fafc;
    line-height: 1.6;
    font-size: 16px;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Source Sans 3', 'Helvetica Neue', Helvetica, sans-serif;
}

em, i:not(.fas):not(.fab):not(.ai) {
    font-family: 'Source Sans 3', 'Helvetica Neue', Helvetica, sans-serif;
    font-style: italic;
}

/* ============================
   Glassmorphism Navigation
   ============================ */
.glass {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.03);
}

.nav-item {
    position: relative;
    font-weight: 500;
    color: #475569;
    transition: color 0.2s;
}

.nav-item:hover {
    color: #1e293b;
}

.nav-item::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: #d4a562;
    transition: width 0.3s ease;
}

.nav-item:hover::after {
    width: 100%;
}

/* ============================
   Profile / Sidebar
   ============================ */
.profile-image-container {
    position: relative;
    z-index: 10;
}

/* ============================
   Section Styling
   ============================ */
section {
    position: relative;
}

.section-header h2 {
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 0;
    width: 40%;
    height: 3px;
    background-color: rgba(212, 165, 98, 0.3);
    z-index: -1;
}

/* ============================
   Main Layout Grid
   ============================ */
.grid-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 1024px) {
    .grid-layout {
        grid-template-columns: 320px 1fr;
        gap: 4rem;
        align-items: start;
    }

    .profile-column {
        position: sticky;
        top: 6rem;
        align-self: start;
        max-height: calc(100vh - 7rem);
        overflow-y: auto;
        scrollbar-width: thin;
    }
}

/* Tighten the sticky left column on shorter viewports (e.g., laptops/ThinkPads) */
/* so the scroll fallback rarely triggers. Mac/larger screens are unaffected. */
@media (max-height: 850px) and (min-width: 1024px) {
    .profile-card .profile-image-container {
        max-width: 160px;
        margin-bottom: 1rem;
    }

    .profile-card > .text-center {
        margin-bottom: 1rem;
    }

    .profile-card .social-links {
        margin-bottom: 1rem;
    }

    .profile-card .research-interests-card {
        padding: 1rem;
        margin-bottom: 0;
    }

    .research-interests-card h3 {
        margin-bottom: 0.75rem;
        padding-bottom: 0.25rem;
    }
}

/* ============================
   Cards
   ============================ */
.news-card, .research-card, .contact-card {
    transition: all 0.3s ease;
}

.news-card:hover, .research-card:hover, .contact-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    border-color: #cbd5e1;
}

/* ============================
   Global Scrollbar
   ============================ */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* ============================
   Utility Classes
   ============================ */
.text-accent {
    color: #d4a562;
}

.bg-accent {
    background-color: #d4a562;
}

.border-accent {
    border-color: #d4a562;
}

.hover\:text-accent:hover {
    color: #d4a562;
}

/* Link Highlight */
.link-highlight {
    color: #d4a562;
    text-decoration: underline;
}

.link-highlight:hover {
    color: #b88a4d;
}

/* ============================
   Publication Styles
   ============================ */
.pub-year-group {
    margin-bottom: 1rem;
}

.pub-year-header {
    font-family: 'Source Sans 3', sans-serif;
    font-size: 1.15rem;
    font-weight: 700;
    font-style: italic;
    letter-spacing: 0.05em;
    color: #1e293b;
    margin-bottom: 0.6rem;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 0.25rem;
    display: inline-block;
}

.pub-section-header {
    font-family: 'Source Sans 3', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: #1e293b;
    margin-top: 1.25rem;
    margin-bottom: 0.6rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid #e2e8f0;
}

.pub-section-header:first-child {
    margin-top: 0;
}

.pub-list-ul {
    list-style-type: disc;
    padding-left: 1.5rem;
}

.pub-list-item {
    margin-bottom: 0.3rem;
    line-height: 1.5;
    font-size: 16px;
    color: #334155;
}

.pub-list-item em {
    font-style: italic;
}

.pub-list-item .pub-doi-link {
    display: inline-block;
    font-size: 0.8125rem;
    padding: 0.05rem 0.4rem;
    border: 1px solid #cbd5e1;
    border-radius: 4px;
    color: #475569;
    margin-left: 0.25rem;
    text-decoration: none;
    transition: all 0.2s;
    background-color: white;
}

.pub-list-item .pub-doi-link:hover {
    border-color: #d4a562;
    color: #d4a562;
    background-color: #fffbeb;
}

.pub-reprint {
    font-size: 0.8125rem;
    color: #64748b;
    margin-top: 0.1rem;
}

/* Author name highlight */
.author-highlight {
    color: #d4a562;
    font-weight: 700;
}

/* ============================
   News Section - Scrollable
   ============================ */
.news-scroll-wrapper {
    position: relative;
}

.news-scroll-container {
    max-height: 320px;
    overflow-y: auto;
    padding-right: 0.5rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.75rem;
    padding: 1rem;
    background: #fafbfc;
}

.news-scroll-container::-webkit-scrollbar {
    width: 6px;
}

.news-scroll-container::-webkit-scrollbar-track {
    background: transparent;
}

.news-scroll-container::-webkit-scrollbar-thumb {
    background: #d4a562;
    border-radius: 3px;
}

.news-scroll-container::-webkit-scrollbar-thumb:hover {
    background: #b88a4d;
}

.news-item {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 1rem;
    align-items: baseline;
    padding-bottom: 0.3rem;
    margin-bottom: 0.3rem;
    border-bottom: 1px dashed #e2e8f0;
}

.news-date {
    font-weight: 500;
    font-size: 0.8125rem;
    color: #64748b;
    white-space: nowrap;
}

.news-content {
    font-size: 16px;
    color: #334155;
    line-height: 1.5;
}

.news-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

/* Scroll hint */
.scroll-hint {
    text-align: right;
    font-size: 0.8125rem;
    color: #64748b;
    padding-bottom: 0.3rem;
}

/* ============================
   Consistent Text Sizes
   ============================ */
.prose p,
.timeline-content p,
.thrust-card p,
.contact-card p,
.contact-card li {
    font-size: 16px;
    line-height: 1.5;
    text-align: left;
}

/* Tighter paragraph spacing */
.prose p {
    margin-bottom: 0.4rem;
}

/* Timeline items tighter spacing */
.timeline.space-y-4 > * + * {
    margin-top: 0.6rem;
}

/* ============================
   Contact Form
   ============================ */
.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    font-family: 'Source Sans 3', sans-serif;
    font-size: 15px;
    color: #334155;
    background: white;
    transition: border-color 0.2s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #d4a562;
    box-shadow: 0 0 0 2px rgba(212, 165, 98, 0.15);
}

.contact-form label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #64748b;
    margin-bottom: 0.3rem;
}

.contact-form button {
    background-color: #d4a562;
    color: white;
    padding: 0.6rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-family: 'Source Sans 3', sans-serif;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.contact-form button:hover {
    background-color: #b88a4d;
}

/* ============================
   Mobile Layout
   ============================ */
@media (max-width: 640px) {
    .news-item {
        grid-template-columns: 80px 1fr;
        gap: 0.75rem;
    }
}

/* Research interest card text justify */
.thrust-card p {
    text-align: justify;
}

/* ============================
   Contact: Kat Kat sticker
   ============================ */
.kat-sticker {
    position: relative;
    display: inline-block;
    margin: 0;
    cursor: pointer;
    transition: transform 0.35s ease;
    animation: kat-float 5s ease-in-out infinite;
}

.kat-sticker:hover,
.kat-sticker:focus-visible {
    transform: rotate(-4deg) scale(1.04);
    outline: none;
}

.kat-img {
    display: block;
    width: 150px;
    height: auto;
    max-width: 100%;
    /* white sticker outline + soft shadow, drawn around the transparent cut-out */
    filter: drop-shadow(3px 0 0 #fff) drop-shadow(-3px 0 0 #fff)
            drop-shadow(0 3px 0 #fff) drop-shadow(0 -3px 0 #fff)
            drop-shadow(2px 2px 0 #fff) drop-shadow(-2px -2px 0 #fff)
            drop-shadow(2px -2px 0 #fff) drop-shadow(-2px 2px 0 #fff)
            drop-shadow(0 8px 14px rgba(15, 23, 42, 0.14));
}

.kat-bubble {
    position: absolute;
    top: 6px;
    left: -14px;
    background: #fdf6ea;
    border: 1px solid #e6cfa6;
    border-radius: 999px;
    padding: 0.1rem 0.65rem;
    font-family: 'Patrick Hand', 'Source Sans 3', 'Helvetica Neue', Helvetica, sans-serif;
    font-size: 15px;
    color: #8a6a3a;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transform: translateY(6px) scale(0.9);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.kat-sticker:hover .kat-bubble,
.kat-sticker:focus-visible .kat-bubble {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.kat-sticker { flex-shrink: 0; }

.contact-card .kat-caption {
    margin: 0;
    font-family: 'Patrick Hand', 'Source Sans 3', 'Helvetica Neue', Helvetica, sans-serif;
    font-size: 16px;
    line-height: 1.35;
    color: #475569;
    text-align: left;
}

/* speech bubble with a tail pointing at the photo */
.kat-speech {
    position: relative;
    flex: 1 1 auto;
    background: #fdf6ea;
    border: 1px solid #e6cfa6;
    border-radius: 20px;
    padding: 0.65rem 0.95rem;
    box-shadow: 0 3px 8px rgba(212, 165, 98, 0.18);
    transform-origin: left center;
    transform: rotate(-3deg);
    transition: transform 0.35s ease;
}

.kat-corner:hover .kat-speech {
    transform: rotate(-3deg) scale(1.03);
}

.kat-speech::before,
.kat-speech::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 0;
    height: 0;
    border-style: solid;
    transform: translateY(-50%);
}

.kat-speech::before {
    left: -10px;
    border-width: 9px 10px 9px 0;
    border-color: transparent #e6cfa6 transparent transparent;
}

.kat-speech::after {
    left: -8px;
    border-width: 8px 9px 8px 0;
    border-color: transparent #fdf6ea transparent transparent;
}

@keyframes kat-float {
    0%, 100% { translate: 0 0; }
    50% { translate: 0 -5px; }
}

@media (prefers-reduced-motion: reduce) {
    .kat-sticker, .kat-speech { animation: none; transition: none; }
}

@media (max-width: 640px) {
    .kat-img { width: 125px; }
    .contact-card .kat-caption { font-size: 15px; }
    .kat-speech { padding: 0.55rem 0.8rem; }
}